Detachable float plug



G. J. NASH 2,202,461

DETACHABLE FLOAT PLUG Filed Nov. 1, 193.7 2 Sheets-Sheet 1 May 28, 1940.

INVENTQR.

ATTORNEY.

serum/V0181,

May 28, 1940. 4 J. H 2,202,461

' DETACHABLE FLO-AT PLUG I v Filed Nov 1', 1937 2 Sheets-Sheet 2 N VENTOR.

ATTORNEY.

Patented May is, 1940 tion with cementing casings larly-soil wells, r I

353 An object of this invention is to provide a-jnonmetallic plugthat'may-be detac'hably aflixed to a casingotthe usual-types. I Y 1Another object of thislinvention. is togprovide' a detachableplug thatmaybe made invarying in wells, particu-i- 1 lengths to accommodate:varying conditions,"

-' while at the same time'being made to atta'clrto auvariety ofdifferent casings. I Another object of this invention is to provide adetachable,- non-metallic" casing plug having a '15 valve therein, whichis composed of material that is fairly easy to-breakup'-,b'y...-drilling, yet is aof..,suflicient. strength towithstand thepressure to. which 'jt is normally subjected. .5

. It. is to be: understood that While thejidrawing I illustrate apreferred embodiment offthe-1invention together with modificationsthereof; the design may'be' varied andfchanges made in the minor detailsof construction to meet specific needs and requirements,- within thescope of the 'spiritythereof. In the drawings:

invention as claimed without departlngfromethe Fig. 1 is a verticalsection through thelower portion. of'ia Iwellicasing, having theinvention applied thereto, parts being in elevation; Fig. 2 is a topplan view of the float shoe plug, detached;

s Fig. 3 is a side elevation thereof;

Fig. 4 is a vertical sectional view, partly in elevation, of a [modifiedform of float pluginst'alled.

in the casing at a'coupling; and

Fig. 5 is a similar view of another form of plug, detached. I

The numeral 5 designates a well casing,to the lower end of which isattached a .shoe 6 by a 6 screv7-threaded connection, as shownin Fig.-1.

The shoe 6 normally has an internal-shoulder 1 intermediate the upperand lower ends thereof. A casing shoe plug '8, preferably molded ofconcrete, has a reduced upper end'pcrtion H] which bolts9-extend,.secur-ing the plug 8 to the shoe. 6.

The cross-bar l2 hasa hole 3 l3 therein.

This invention relates-to an 'improvement'. in detachable float plugswhich areused'in .co'nnec- 1 of difierent casing shoes 6 forattachment'pr- .ing material forced downward through the easthe floatplug, thereby leaving the cement tail-' on face H or plug 22.

The plug 8 has a passageway l8. therethrough. I

the lower .end portionof which is enlarged" at -16, to receive a valve.l5. The valve 5. is adapted to engage and seat one. shoulder l1,being-supported by a spring I4 which extends upwardly f.

through the passagewayv l8, and has its upper ably rounded at 20 toprevent'itsr engagement to with'the sidewalls asthecasingi is being low-.ered: into the well.

By providing the valved passageway'through the plug 8, fluid or liquidcement-may be pumped downwardpast the 'valve "l5, but said valve pre-'it vents any upward or" backiiow therethrough.

The plug 8 may be made in' varying length'sto accommodate: varying 1conditions, and at the sameytime, it may be made to attachto a varietydetachment therefrom. By. molding the'plug of concrete, it may be brokenup by drilling; and

yet isof sufficient strength to Withstand the mesa sure to which it isnormally subjected. However. any materialmay be usedthat .may be easilycrushed, such as. fBakelitef or other molded plastic,or the like. W Y

. mThe plug:8 is. used in the bu sual .manner iofia plug on a cementingcasing, having the ceinenting 5, shoe 6 and plug8, past the valve [5there'- in, and out around'the casing-to cement the well, the valvepreventing any backflow therethrough.

A modification of this detachable float plug maybe provided to leave acement column below ings in the casing. This insures that good 'ce-"ment will be forced out between the walls of the casing and the Well. I

- In the modified form or the inventionshown in'Fig. 4', the plug isshown installed within the casing 5 at a collar 2|. The'cement plug is.designated 22 and has a cast iron or metallic ring 23 moldedthereinaround the same, and said ring fits between the upper. and lower jointsof the casing 5. A gasket 24 maybe imbedded within a recess-in thecement plug 22 to prevent the passage of cement upward between thecasing 5 and plug 22. A passageway I8 is provided through the plugand'is enlarged-at the lowerend It to receive valve I5. A springgM' car-'ried by pin l9 holds the valve I5 closed until opened by the pressureof the liquid cement passing'downwardly therethrough. valve seatsOFFICE: v I 2 2o2 4 1.1 I I l I "1 r I IDETMHABL r oar'rwe p Gerald :J.Nashrwichita Falls, Tex. I Application ndvmtenrias'v, seam; 172,263

' {12 Claims. '(ct' c l s) In the further modification of the detachablefloat plug as shown in Fig. 5, this is substantially the same as shownin Fig. 4 except that a shoulder 25 is molded of cement integral withthe plug 21 and has soft metallic ferrules 26, such as lead, which formgaskets when the casing is joined together, as the casing will cut intothese ferrules and prevent leakage between plug and the sections of thecasing 5.

I claim:

1. In combination with well casing and a casing shoe, of a valvednon-metallic detachable plug fitted to the lower end of the casing shoe,means for engaging the casing shoe, and a detachable fasteningconnecting said engaging means with the plug.

2. In combination with a well casing and a casing shoe having aninternal shoulder, of a non-metallic valved plug, means for engagingsaid shoulder, and means for detachably connecting said engaging meanswith said plug for detachably connecting said plug with the shoe.

3. In combination with a well casing and a casing shoe having ashoulder, of a non-metallic valved plug having bolts therein, and a barengaging said shoulder and said bolts detachably connecting said plugwith the shoe.

4. In combination with a well casing and a casing shoe having ashoulder, of a shouldered nonmetallic detachable plug, a gasketintermediate the end of said casing shoe and the shoulder of said plug,said plug having a passage therein, a valve within said passage,resilient means for seating said valve, and means for removably securingsaid plug in fixed relation to said shoe.

5. A casing having a plug detachable therefrom, said plug having apassageway therethrough with a valve seat therein, a valve in positionto engage said valve seat, resilient means acting on said valve tendingto seat the same, means for slidable longitudinal insertion of said plugto an approximate seated position in said casing, means for exerting alongitudinal pull on said plug rei ative to said casing, and means fordetachably g connecting said plug with the casing.

6. A- casing plug having a valved passageway therethro-ugh, said plughaving end portions adapted to be received in casing sections, and

having an intermediate peripheral portion of uniformly greater diameterthan said end portions and in position to fit between the ends of saidcasing sections.

7. The combination with well casing sections and a coupling joining thesections together, of a casing plug having a valved passagewaytherethrough, said plug having end portions slidably and removablyreceived in said adjacent ends of said casing sections, and a peripheralenlargement on said plug of greater diameter than said end portions andfitting between the adjacent ends of said sections.

8. In combination with a well casing shoe having an internal shoulder,of a valved non-metallic plug inserted into said shoe and slidablelongitudinally relative thereto, and releasable means connecting saidplug and shoulder in assembled relation and permitting release andlongitudinal removal of the plug from the shoe.

9. In combination with a well casing shoe having an internal shoulder,of a valved non-metallic plug inserted into said shoe and slidablelongitudinally relative thereto, abutment means overlying the shoulder,and means movably connecting said abutment means with the plug forrelease thereof from the shoulder for removal of the plug from the shoe.

10. The combination of a casing section, a casing plug slidablytelescoped with said casing section and having a valved passageway therethrough, holding means engaging the casing section, and a detachablefastening connecting the holding means with the plug. I

11. The combination of a casing section, a casing plug slidablyteles'coped with said casing section and having a valved passagewaytherethrough, holding means engaging the casing section, and a boltconnecting the holding means with the plug.

12. The combination of a casing section, 2.- casing plug slidablytelescoped with said casing section and having a valved passagewaytherethrough, a plate or plates having interlocked engagement with thecasing section, and bolt means detachably connectingthe plate or plateswith the plug.

GERALD J. NASH.

